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ID:36360471
大小:4.49 MB
页数:93页
时间:2019-05-10
《真空填土自载联合预压加固软土机理及其实际应用研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、浙江大学博士后学位论文真空-填土自载联合预压加固软土机理及其实际应用研究姓名:李昌宁申请学位级别:博士后专业:岩土工程指导教师:龚晓南20031201ABSTRACTThecontradictionbetweenrapideconomicgrowthandhigh.speedtransportationdemandineasternareasmakesitnecessaryandemergencytobuildhigh—speedrailwayinsoftground.It’Struethatbuildingthehigh—sp
2、eedrailwayinsoftgroundismoredifficultthaninothergroundconditionsbecausethedemandofembankmentsettlementafterprojectioniSnoteasytocontrolandmeetwhichisstrictlyrequiredinbuildinghigh—speedrailwayduetothewellknownreasons.Thatrequirestheeffectiveandeconomicsoftgroundtreat
3、menttomakesurethattheembankmentofsettlementafterprojectionmeetsdemanding.Thecombinedmethodofvacuum—surchargepreloadingisfeasibleandwidelyusedintreatingsoftgroundwithseveraladvantagessuchassavingmoney,shorteningtimeandSOon.Butrecentstudyonvacuumpreloadingconsolidating
4、softgroundisstillnotcompletelydemonstratingthemechanismofitthatmakesitabsolutelynecessarytoresearchfurthcrinit.Throughtheoreticalanalyzingandlabexperimentscombinedwithsitemodeltests,thepaperputsforththedesignofcombinedmethodofvacuum-surchargepreloadingintreatingdeepa
5、ndcomplicatedsoftgroundofhigh—speedrailway,itsfeasibletechnicsandeffectstosurroundingenvironment.Somekeytechniquessuchaseffectiveconsolidationdepth,relationofconsolidationresultandvacuumenergy,settlementcontrolafterprojectionandmeasurestocontroleffectstosurroundingen
6、vironment,ere.,aresolvedtosomeextent.Theresultsobtainedareimportanttodevelopandperfectthemechanismofvacuumpreloadinginconsolidatingsoftground,whichcouldbewidelyusedintreatingdeepandcomplicatedsoftgroundofhighspeedrailwayeffectivelyandeconomically.Keywords:combinedmet
7、hodofvacuum—surchargepreloading;softground;high·speedrailway;settlementafterprojection2前言随着我国东部经济快速增长与交通运输需求之间矛盾曰益突出.修建京沪高速铁路以及东部地区城际高等级铁路已迫在眉睫。高速铁路对路基的变形控制要求很高,它提高了对路堤地基条件的要求,强调对工后沉降的严格要求,这就要求对地基进行经济、有效的处理。京沪及东部城际高速铁路沿线软土地基不但分布广泛,而且成因类型复杂,厚度大,-。般地基处理方法成本高、难度大。真空一填土自
8、载联合预压技术具有良好的经济性和独特的优越性,其特点是路基的填筑土可作为堆载荷载与真空起联合进行预压,路基稳定性不存在问题,填土速率也不受限制;路基填筑完成后,其上不必继续堆载超载土方,真空可相当于超载加速土体固结速度,没有超载土方的堆移和挖除工程,缩短工期:在
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